Answer:
64 left handed girls
25 left handed boys
89 total left handed students
Explanation:
Multiply 320 x 0.2
Multiply 250 x 0.1
You can think of it this way, 0.2 is 2/10 and 0.1 is 1/10 so take 20 percent of 320 and 10 percent of 250
Add them up for your answer 64 + 25 = 89